Answers for "Should the number of nodes be multiples of replication factor?"
https://community.datastax.com/questions/10711/replication-factor-and-number-of-nodes.html
The latest answers for the question "Should the number of nodes be multiples of replication factor?"Answer by Erick Ramirez
https://community.datastax.com/answers/10742/view.html
<div class="fr-view clearfix"><p>No, that isn't correct. I suspect you are referring to my responses in other questions such as <a rel="noopener noreferrer" href="/questions/1128/" target="_blank">#1128</a>.</p><p>What I said was:</p><blockquote><p>... the number of racks [should be] a multiple of the replication factor ...</p></blockquote><p>For clarity, I was talking about achieving a balanced distribution of load (data size) across nodes in the cluster. To achieve this, I recommend a balanced topology where:</p><ul><li>the number of racks is a multiple of the replication factor (for example, 3, 6 or 9 racks and so on), and</li><li>the number of nodes in each rack is identical.</li></ul><p>In your case, the number of racks (3) is a multiple of the replication factor (also 3).</p><p>If you want a balanced distribution of data, you should decommission an equal number of nodes from each rack so take away 3 nodes each from <code>usw2a</code>, <code>usw2b</code> and <code>usw2c</code>. Cheers!</p></div>Fri, 19 Mar 2021 08:33:53 GMTErick Ramirez